v0.0.2 of flutter_file_hash

Native Flutter file and string hashing powered by Zig, with SHA, MD5, HMAC, BLAKE3, XXH3, cancellation, and Android content:// streams. Changelog excerpt: - Add dartdoc comments for the public Dart API, including fileHash, stringHash, HashAlgorithm, HashOptions, cancellation types, and package exceptions. - Improve pub.dev score readiness by documenting the exported API surface. - Simplify README badges to match the React Native package style: package version and monthly downloads. - Align the pub.dev publishing workflow with tag-based GitHub Actions publishing. ---